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POExecutor wait for ever in a singleton class
 

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    <p>I have implemented a singleton (manager) to manage some related tasks, inside this manager I am using an executor to handle 10 task at the same time, I was using linkedBlockingQueue with no limit, and that's working good so far, but now I need to set a limitation to my executor queue because I have a lot of tasks (hundreds of thousands tasks), and I don’t want to put them all in my queue that causing me a performance issues, so what I have done:</p> <p>here is my Executor :</p> <pre><code>public class MyThreadPoolExecutor extends ThreadPoolExecutor { public MyThreadPoolExecutor(int corePoolSize, BlockingQueue&lt;Runnable&gt; workQueue) { super(corePoolSize, corePoolSize + 5, 500, TimeUnit.MILLISECONDS, workQueue); } @Override protected void beforeExecute(Thread t, Runnable r) { super.beforeExecute(t, r); //Do something to my task } @Override protected void afterExecute(Runnable r, Throwable t) { super.afterExecute(r, t); if(t != null) { // } else { //Do something to my task } } } </code></pre> <p>and here is my manager :</p> <pre><code>public final class MyManager { private static MyManager manager = new MyManager(); public static final int queueMaxSize = 100; private BlockingQueue&lt;Runnable&gt; workQueue = new ArrayBlockingQueue&lt;Runnable&gt;(queueMaxSize); private ExecutorService executor = new MyThreadPoolExecutor(10, workQueue); /** * constructor */ private MyManager() {} public static MyManager getInstance(){ if (manager == null){ synchronized(MyManager.class){ if (manager == null){ manager = new MyManager(); } } } return manager; } /** */ public void executeTask(Integer key){ executeTask(key, Locale.getDefault()); } /** */ public void executeTask(Integer key, Locale locale) { Tasker task = new Tasker(key, locale); executor.execute(task); } } </code></pre> <p>and here the class that asking to do the tasks :</p> <pre><code>public class MyClass { public void doTasks() { //geting my tasks in array of list, its holding more than 900 000 tasks, //sometimes its holding up to 10 million task like : MyManager.getInstance().isFull() {\\wait, then ask again} ArrayList&lt;Integer&gt; myTasks = getAllTasksIds(); for(Integer id : myTasks) { //if i perform a waiting here it will be waiting for ever. MyManaget.getInstance().executeTask(id); } } } </code></pre> <p>What I want exactly to wait the executor until finish his queue tasks, then re-full it again.</p> <p>But the problem is when I try to wait based on queue size, the executor won’t work, and its wait forever because the queue still full.</p>
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    1. USSalah
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    1. COWhy bother with the lazy initialization and double locking shennanigans when setting up your Manager? You've already initialized it by the looks of things.
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      1. USDaveH
    2. COYour `getInstance` method should just be: `public static MyManager getInstance() { return manager; }`.
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      1. USassylias
    3. COYou could subclass ArrayBlockingQueue that knows it's maxsize and has a callback method (or object that knows from where to fill) that fills it back when it becomes empty.
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      1. USTala
 

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